[Go] - EOL v1.21 changes (#1180)

* [Go] - EOL v1.21 changes

* Update src/go/manifest.json

Co-authored-by: Samruddhi Khandale <[email protected]>

* one change that was left to be removed - suggested by pr review comments ! thanks !

---------

Co-authored-by: Samruddhi Khandale <[email protected]>

Author: gauravsaini04

src/go/README.md

@@ -10,7 +10,7 @@
 | *Categories* | Core, Languages |
 | *Definition type* | Dockerfile |
 | *Published images* | mcr.microsoft.com/devcontainers/go |
-| *Available image variants* | 1 / 1-bookworm, 1.23 / 1.23-bookworm, 1.22 / 1.22-bookworm, 1-bullseye, 1.22-bullseye, 1.21-bullseye ([full list](https://mcr.microsoft.com/v2/devcontainers/go/tags/list)) |
+| *Available image variants* | 1 / 1-bookworm, 1.23 / 1.23-bookworm, 1.22 / 1.22-bookworm, 1-bullseye, 1.22-bullseye ([full list](https://mcr.microsoft.com/v2/devcontainers/go/tags/list)) |
 | *Published image architecture(s)* | x86-64, arm64/aarch64 for `bookworm`, and `bullseye` variants |
 | *Container host OS support* | Linux, macOS, Windows |
 | *Container OS* | Debian |

src/go/manifest.json

@@ -3,10 +3,8 @@
   "variants": [
     "1.23-bookworm",
     "1.22-bookworm",
-    "1.21-bookworm",
     "1.23-bullseye",
-    "1.22-bullseye",
-    "1.21-bullseye"
+    "1.22-bullseye"
   ],
   "build": {
     "latest": "1.23-bookworm",
@@ -23,21 +21,13 @@
         "linux/amd64",
         "linux/arm64"
       ],
-      "1.21-bookworm": [
-        "linux/amd64",
-        "linux/arm64"
-      ],
       "1.23-bullseye": [
         "linux/amd64",
         "linux/arm64"
       ],
       "1.22-bullseye": [
         "linux/amd64",
         "linux/arm64"
-      ],
-      "1.21-bullseye": [
-        "linux/amd64",
-        "linux/arm64"
       ]
     },
     "variantTags": {
@@ -53,9 +43,6 @@
       "1.23-bullseye": [
         "go:${VERSION}-1-bullseye",
         "go:${VERSION}-bullseye"
-      ],
-      "1.21-bookworm": [
-        "go:${VERSION}-1.21"
       ]
     }
   },